/* * Routines providing a simple monitor for use on the PowerMac. * * Copyright (C) 1996-2005 Paul Mackerras. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include #include #include #include #include static char namebuf[KSYM_NAME_LEN+1]; /* Shamelessly lifted from Linux Xmon try to keep pristene */ #ifdef __powerpc64__ #define LRSAVE_OFFSET 0x10 #define REG_FRAME_MARKER 0x7265677368657265ul /* "regshere" */ #define MARKER_OFFSET 0x60 #define REGS_OFFSET 0x70 #define REG "%016lX" #else #define LRSAVE_OFFSET 4 #define REG_FRAME_MARKER 0x72656773 #define MARKER_OFFSET 8 #define REGS_OFFSET 16 #define REG "%08lX" #endif #define TRAP(regs) ((regs)->entry_vector & ~0xF) static int xmon_depth_to_print = 64; /* Very cheap human name for vector lookup. */ static const char *getvecname(unsigned long vec) { char *ret; switch (vec) { case 0x100: ret = "(System Reset)"; break; case 0x200: ret = "(Machine Check)"; break; case 0x300: ret = "(Data Access)"; break; case 0x380: ret = "(Data SLB Access)"; break; case 0x400: ret = "(Instruction Access)"; break; case 0x480: ret = "(Instruction SLB Access)"; break; case 0x500: ret = "(Hardware Interrupt)"; break; case 0x600: ret = "(Alignment)"; break; case 0x700: ret = "(Program Check)"; break; case 0x800: ret = "(FPU Unavailable)"; break; case 0x900: ret = "(Decrementer)"; break; case 0xc00: ret = "(System Call)"; break; case 0xd00: ret = "(Single Step)"; break; case 0xf00: ret = "(Performance Monitor)"; break; case 0xf20: ret = "(Altivec Unavailable)"; break; case 0x1300: ret = "(Instruction Breakpoint)"; break; default: ret = ""; } return ret; } static int mread(unsigned long adrs, void *buf, int size) { memcpy(buf, (void *)adrs, size); return size; } static void get_function_bounds(unsigned long pc, unsigned long *startp, unsigned long *endp) { unsigned long size, offset; const char *name; *startp = *endp = 0; if (pc == 0) return; name = symbols_lookup(pc, &size, &offset, namebuf); if (name != NULL) { *startp = pc - offset; *endp = pc - offset + size; } } /* Print an address in numeric and symbolic form (if possible) */ static void xmon_print_symbol(unsigned long address, const char *mid, const char *after) { const char *name = NULL; unsigned long offset, size; printk(REG, address); name = symbols_lookup(address, &size, &offset, namebuf); if (name) { printk("%s%s+%#lx/%#lx", mid, name, offset, size); } printk("%s", after); } static void backtrace( unsigned long sp, unsigned long lr, unsigned long pc) { unsigned long ip; unsigned long newsp; unsigned long marker; int count = 0; struct cpu_user_regs regs; do { if (sp > xenheap_phys_end) { if (sp != 0) printk("SP (%lx) is not in xen space\n", sp); break; } if (!mread(sp + LRSAVE_OFFSET, &ip, sizeof(unsigned long)) || !mread(sp, &newsp, sizeof(unsigned long))) { printk("Couldn't read stack frame at %lx\n", sp); break; } /* * For the first stack frame, try to work out if * LR and/or the saved LR value in the bottommost * stack frame are valid. */ if ((pc | lr) != 0) { unsigned long fnstart, fnend; unsigned long nextip; int printip = 1; get_function_bounds(pc, &fnstart, &fnend); nextip = 0; if (newsp > sp) mread(newsp + LRSAVE_OFFSET, &nextip, sizeof(unsigned long)); if (lr == ip) { if (lr >= xenheap_phys_end || (fnstart <= lr && lr < fnend)) printip = 0; } else if (lr == nextip) { printip = 0; } else if (lr < xenheap_phys_end && !(fnstart <= lr && lr < fnend)) { printk("[link register ] "); xmon_print_symbol(lr, " ", "\n"); } if (printip) { printk("["REG"] ", sp); xmon_print_symbol(ip, " ", " (unreliable)\n"); } pc = lr = 0; } else { printk("["REG"] ", sp); xmon_print_symbol(ip, " ", "\n"); } /* Look for "regshere" marker to see if this is an exception frame. */ if (mread(sp + MARKER_OFFSET, &marker, sizeof(unsigned long)) && marker == REG_FRAME_MARKER) { if (mread(sp + REGS_OFFSET, ®s, sizeof(regs)) != sizeof(regs)) { printk("Couldn't read registers at %lx\n", sp + REGS_OFFSET); break; } printk("--- Exception: %x %s at ", regs.entry_vector, getvecname(TRAP(®s))); pc = regs.pc; lr = regs.lr; xmon_print_symbol(pc, " ", "\n"); } if (newsp == 0) break; sp = newsp; } while (count++ < xmon_depth_to_print); } void show_backtrace(ulong sp, ulong lr, ulong pc) { console_start_sync(); backtrace(sp, lr, pc); console_end_sync(); } void __warn(char *file, int line) { ulong sp; ulong lr; console_start_sync(); printk("WARN at %s:%d\n", file, line); sp = (ulong)__builtin_frame_address(0); lr = (ulong)__builtin_return_address(0); backtrace(sp, lr, lr); console_end_sync(); } a> 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 
/*
             LUFA Library
     Copyright (C) Dean Camera, 2017.

  dean [at] fourwalledcubicle [dot] com
           www.lufa-lib.org
*/

/*
  Copyright 2017  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, distribute, and sell this
  software and its documentation for any purpose is hereby granted
  without fee, provided that the above copyright notice appear in
  all copies and that both that the copyright notice and this
  permission notice and warranty disclaimer appear in supporting
  documentation, and that the name of the author not be used in
  advertising or publicity pertaining to distribution of the
  software without specific, written prior permission.

  The author disclaims all warranties with regard to this
  software, including all implied warranties of merchantability
  and fitness.  In no event shall the author be liable for any
  special, indirect or consequential damages or any damages
  whatsoever resulting from loss of use, data or profits, whether
  in an action of contract, negligence or other tortious action,
  arising out of or in connection with the use or performance of
  this software.
*/

/** \file
 *
 *  Main source file for the Audio Input demo. This file contains the main tasks of the demo and
 *  is responsible for the initial application hardware configuration.
 */

#include "AudioInput.h"

/** Flag to indicate if the streaming audio alternative interface has been selected by the host. */
static bool StreamingAudioInterfaceSelected = false;

/** Current audio sampling frequency of the streaming audio endpoint. */
static uint32_t CurrentAudioSampleFrequency = 48000;


/** Main program entry point. This routine contains the overall program flow, including initial
 *  setup of all components and the main program loop.
 */
int main(void)
{
	SetupHardware();

	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
	GlobalInterruptEnable();

	for (;;)
	{
		USB_USBTask();
	}
}

/** Configures the board hardware and chip peripherals for the demo's functionality. */
void SetupHardware(void)
{
#if (ARCH == ARCH_AVR8)
	/* Disable watchdog if enabled by bootloader/fuses */
	MCUSR &= ~(1 << WDRF);
	wdt_disable();

	/* Disable clock division */
	clock_prescale_set(clock_div_1);
#endif

	/* Hardware Initialization */
	LEDs_Init();
	Buttons_Init();
	ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);
	ADC_SetupChannel(MIC_IN_ADC_CHANNEL);
	USB_Init();

	/* Start the ADC conversion in free running mode */
	ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | ADC_GET_CHANNEL_MASK(MIC_IN_ADC_CHANNEL));
}

/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs, and
 *  configures the sample update and PWM timers.
 */
void EVENT_USB_Device_Connect(void)
{
	/* Indicate USB enumerating */
	LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);

	/* Sample reload timer initialization */
	TIMSK0  = (1 << OCIE0A);
	OCR0A   = ((F_CPU / 8 / CurrentAudioSampleFrequency) - 1);
	TCCR0A  = (1 << WGM01);  // CTC mode
	TCCR0B  = (1 << CS01);   // Fcpu/8 speed
}

/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
 *  the status LEDs, disables the sample update and PWM output timers and stops the USB and Audio management tasks.
 */
void EVENT_USB_Device_Disconnect(void)
{
	/* Stop the sample reload timer */
	TCCR0B = 0;

	/* Indicate streaming audio interface not selected */
	StreamingAudioInterfaceSelected = false;

	/* Indicate USB not ready */
	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
}

/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
 *  of the USB device after enumeration - the device endpoints are configured.
 */
void EVENT_USB_Device_ConfigurationChanged(void)
{
	bool ConfigSuccess = true;

	/* Setup Audio Stream Endpoint */
	ConfigSuccess &= Endpoint_ConfigureEndpoint(AUDIO_STREAM_EPADDR, EP_TYPE_ISOCHRONOUS, AUDIO_STREAM_EPSIZE, 2);

	/* Indicate endpoint configuration success or failure */
	LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
}

/** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to
 *  the device from the USB host before passing along unhandled control requests to the library for processing
 *  internally.
 */
void EVENT_USB_Device_ControlRequest(void)
{
	/* Process General and Audio specific control requests */
	switch (USB_ControlRequest.bRequest)
	{
		case REQ_SetInterface:
			/* Set Interface is not handled by the library, as its function is application-specific */
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();
				Endpoint_ClearStatusStage();

				/* Check if the host is enabling the audio interface (setting AlternateSetting to 1) */
				StreamingAudioInterfaceSelected = ((USB_ControlRequest.wValue) != 0);
			}

			break;
		case AUDIO_REQ_GetStatus:
			/* Get Status request can be directed at either the interface or endpoint, neither is currently used
			 * according to the latest USB Audio 1.0 standard, but must be ACKed with no data when requested */
			if ((USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE)) ||
			    (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_ENDPOINT)))
			{
				Endpoint_ClearSETUP();
				Endpoint_ClearStatusStage();
			}

			break;
		case AUDIO_REQ_SetCurrent:
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_ENDPOINT))
			{
				/* Extract out the relevant request information to get the target Endpoint address and control being set */
				uint8_t EndpointAddress = (uint8_t)USB_ControlRequest.wIndex;
				uint8_t EndpointControl = (USB_ControlRequest.wValue >> 8);

				/* Only handle SET CURRENT requests to the audio endpoint's sample frequency property */
				if ((EndpointAddress == AUDIO_STREAM_EPADDR) && (EndpointControl == AUDIO_EPCONTROL_SamplingFreq))
				{
					uint8_t SampleRate[3];

					Endpoint_ClearSETUP();
					Endpoint_Read_Control_Stream_LE(SampleRate, sizeof(SampleRate));
					Endpoint_ClearIN();

					/* Set the new sampling frequency to the value given by the host */
					CurrentAudioSampleFrequency = (((uint32_t)SampleRate[2] << 16) | ((uint32_t)SampleRate[1] << 8) | (uint32_t)SampleRate[0]);

					/* Adjust sample reload timer to the new frequency */
					OCR0A = ((F_CPU / 8 / CurrentAudioSampleFrequency) - 1);
				}
			}

			break;
		case AUDIO_REQ_GetCurrent:
			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_ENDPOINT))
			{
				/* Extract out the relevant request information to get the target Endpoint address and control being retrieved */
				uint8_t EndpointAddress = (uint8_t)USB_ControlRequest.wIndex;
				uint8_t EndpointControl = (USB_ControlRequest.wValue >> 8);

				/* Only handle GET CURRENT requests to the audio endpoint's sample frequency property */
				if ((EndpointAddress == AUDIO_STREAM_EPADDR) && (EndpointControl == AUDIO_EPCONTROL_SamplingFreq))
				{
					uint8_t SampleRate[3];

					/* Convert the sampling rate value into the 24-bit format the host expects for the property */
					SampleRate[2] = (CurrentAudioSampleFrequency >> 16);
					SampleRate[1] = (CurrentAudioSampleFrequency >> 8);
					SampleRate[0] = (CurrentAudioSampleFrequency &  0xFF);

					Endpoint_ClearSETUP();
					Endpoint_Write_Control_Stream_LE(SampleRate, sizeof(SampleRate));
					Endpoint_ClearOUT();
				}
			}

			break;
	}
}

/** ISR to handle the reloading of the data endpoint with the next sample. */
ISR(TIMER0_COMPA_vect, ISR_BLOCK)
{
	uint8_t PrevEndpoint = Endpoint_GetCurrentEndpoint();

	/* Select the audio stream endpoint */
	Endpoint_SelectEndpoint(AUDIO_STREAM_EPADDR);

	/* Check if the current endpoint can be written to and that the audio interface is enabled */
	if (Endpoint_IsINReady() && StreamingAudioInterfaceSelected)
	{
		int16_t AudioSample;

		#if defined(USE_TEST_TONE)
			static uint8_t SquareWaveSampleCount;
			static int16_t CurrentWaveValue;

			/* In test tone mode, generate a square wave at 1/256 of the sample rate */
			if (SquareWaveSampleCount++ == 0xFF)
			  CurrentWaveValue ^= 0x8000;

			/* Only generate audio if the board button is being pressed */
			AudioSample = (Buttons_GetStatus() & BUTTONS_BUTTON1) ? CurrentWaveValue : 0;
		#else
			/* Audio sample is ADC value scaled to fit the entire range */
			AudioSample = ((SAMPLE_MAX_RANGE / ADC_MAX_RANGE) * ADC_GetResult());

			#if defined(MICROPHONE_BIASED_TO_HALF_RAIL)
			/* Microphone is biased to half rail voltage, subtract the bias from the sample value */
			AudioSample -= (SAMPLE_MAX_RANGE / 2);
			#endif
		#endif

		/* Write the sample to the buffer */
		Endpoint_Write_16_LE(AudioSample);

		/* Check to see if the bank is now full */
		if (!(Endpoint_IsReadWriteAllowed()))
		{
			/* Send the full packet to the host */
			Endpoint_ClearIN();
		}
	}

	Endpoint_SelectEndpoint(PrevEndpoint);
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-28 04:11:53 +0000